Water Quality in Columbia, MD (21042)
EPA violation data for public water systems serving ZIP code 21042.
Active Health Violations
4 health-based violations found in the past 5 years, with at least one still unresolved. Contaminant levels have exceeded federal safety limits. Consider testing your tap water independently.
More violations than 91% of US ZIP codes.
Based on EPA compliance data. Not a substitute for an official water quality report from your utility.
43,327
Population
24
Water Systems
55
Violations (5yr)
4
Health-Based
Location
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Water Systems Serving This Area (24)
Howard County D.P.W. Distribution
All resolvedEllicott City
Glenelg High School
All resolvedBushy Park Es/Glenwood Ms Complex
Glenelg Country School
1 health-basedManor Woods Elem School(Connect To Cws)
Jiffy Mart Finksburg
Folly Quarter Middle School
All resolvedDayton Oaks Elementary School
Triadelphia Ridge Elementary
Lisbon Elementary School
All resolvedWest Friendship Elementary School
Lutheran Village At Miller'S Grant
1 health-basedCountry Corner Snowball, Inc
Triple J Mhp
All resolvedIrish Creek Mhp
1 health-basedSt.Thomas Syrian Orthodox Church
Lakeview Mhp Llc
Fox & Barrel Farm Cafe
Liberty Marathon
U.M. Central Md Research & Education Ctr
1 health-basedHoward Co. Arc / Ellicott Ent.
Glenwood Middle School (See1130001)
Turf Golf Course Restroom (I/C 0130002)
Contaminants Found
Annual water quality report delivery requirement.
Lead and copper testing requirement. Lead exposure can cause developmental harm in children.
Missed testing deadlines — not a detection of bacteria.
Lead & Copper Levels
Lead (Pb)
Exceeds limitSampled: Jun 2025
How Does This Compare?
Columbia (21042) has more violations than 91% of US ZIP codes. The national average is 18.87 violations per ZIP over 5 years. This ZIP has 55.
Recommended Water Filters
Based on health-based violations detected in your area, these filter types are commonly used to address similar contaminants. Consult your water utility's Consumer Confidence Report for the most current data.
Reverse Osmosis System
Highly effective at removing heavy metals, dissolved solids, and a wide range of contaminants. Recommended for homes with lead or arsenic concerns.
Targets:Lead, Copper, Arsenic, Mercury, Cadmium
Look for:NSF/ANSI 58 certified
Always look for filters certified by NSF International for the specific contaminants you want to remove. This is general educational information, not an endorsement of any specific product.